var input = require("fs").readFileSync("input.txt").toString().replace("\n", "");
var dirs = input.split(",");
function simplify(dirs){
	var replacements = [
		[["n", "s"], ""],
		[["ne", "sw"], ""],
		[["nw", "se"], ""],
		[["ne", "nw"], "n"],
		[["se", "sw"], "s"],
		[["ne", "s"], "se"],
		[["se", "n"], "ne"],
		[["sw", "n"], "nw"],
		[["nw", "s"], "sw"],
	];
	var oldlength = 0;
	while(dirs.length != oldlength){
		oldlength = dirs.length;
		for(var replacement of replacements){
			if(dirs.indexOf(replacement[0][0]) > -1 && dirs.indexOf(replacement[0][1]) > -1){
				dirs.splice(dirs.indexOf(replacement[0][0]), 1);
				dirs.splice(dirs.indexOf(replacement[0][1]), 1);
				if(replacement[1]){
					dirs.push(replacement[1]);
				}
			}
		}
	}
	return dirs;
}

var maxlen = 0;

for(var i = 0; i < dirs.length; i++){
	var sub = dirs.slice(0, i);
	var len = simplify(sub).length;
	if(len > maxlen){
		maxlen = len;
	}
	console.log(i/dirs.length);
}
console.log(maxlen);